help on the bootmii, doesn't load when i reset

i bought my wii in august 2007 and now i learned about these hacks to play burned backup games but before i do anything i installed homebrew channel on version 4.0e but now i want to make a backup so i installed bootmii2 and when i reset the wii it doesn't load bootmii there is some problem, i have tried with 3 different sd cards, also i did prepaer my sd card in the installations.

just 5 mins ago i did it again and it worked but the sd card memory was small so i tried on a different bigger memory card and it didn'twork also it doens't work on the one before i used which worked at the start for the first time